President Trump claims Department of Justice was out to “frame” him for “crimes he didn’t commit.”

Rudy Giuliani gave a wide-ranging interview about the President's legal battle with the special counsel. (CNN)

A paranoid-sounding President Trump accused the Justice Department on Friday of trying to frame him for "crimes he didn't commit" — an allegation his own lawyer said might not be true.

Trump's suspicious social media post quoted Fox Business Network anchor David Asman and alluded to an unverified claim that federal investigators planted a spy in his 2016 campaign.

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"Apparently the DOJ put a Spy in the Trump Campaign. This has never been done before and by any means necessary, they are out to frame Donald Trump for crimes he didn't commit," Trump wrote, citing Asman.

"Really bad stuff!" he added.

Trump, who on Thursday said that if there were spies in his campaign it would be "bigger than Watergate," later expanded on his latest conspiracy theory.

"It took place very early on, and long before the phony Russia Hoax became a 'hot' Fake News story," he tweeted. "If true - all time biggest political scandal!"

However, Trump's top attorney claims that the President doesn't know for sure if there was an FBI informant on his team.

Former mayor Rudy Giuliani told CNN in a lengthy interview on Friday that neither he nor the President have proof that a covert operative was sharing details from the inside of the 2016 campaign operation.

"I don't know for sure, nor does the president, that there really was an informant," he said.

Giuliani said that people "off the record" had said there was some informant but that there was no proof, and compared it to the President previously saying that he was wiretapped by the Obama administration.

"For a long time we've been told that there was some kind of infiltration. At one time, the "resident thought it was a wiretap," he added.

The Justice Department has said in court filings that it did not wiretap the President during the 2016 campaign.

Testimony from Glenn Simpson, a former journalist at the opposition research firm Fusion GPS, had previously suggested the FBI was getting information from someone connected to the Trump campaign.

Giuliani admitted that the President doesn't have any proof, but said stranger things have been true.

"He may turn out to be closer to truth than people thought." He said that he has been told "off the record" that there was not just one informant but two.

Giuliani also addressed Trump's legal tangles with special counsel Robert Mueller and again raised the possibility of an interview.

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Mueller is probing Russian election meddling and the possibility that Trump associates coordinated with the Kremlin to influence the election in the President's favor.

Trump and his allies have battled in recent weeks to publicly identify the informant they believe was talking to the feds, the FBI has taken steps to scale back any damage the unmasking may have to ongoing investigations.

During the CNN interview, Giuliani also said that Mueller has agreed to narrow the scope of a potential interview with the president to "about two" topics.

He said that he has been told Mueller doesn't plan to ask the President about the dealings of his former personal attorney Michael Cohen.

"The main focus that we want, I can tell you, simply is Russia," Giuliani said.